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<div class="subTitle">org.apache.commons.lang3.concurrent</div>
<h2 title="Class MultiBackgroundInitializer" class="title">Class MultiBackgroundInitializer</h2>
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<li><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">org.apache.commons.lang3.concurrent.BackgroundInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&gt;</li>
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<li>org.apache.commons.lang3.concurrent.MultiBackgroundInitializer</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/commons/lang3/concurrent/ConcurrentInitializer.html" title="interface in org.apache.commons.lang3.concurrent">ConcurrentInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&gt;</dd>
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<pre>public class <span class="strong">MultiBackgroundInitializer</span>
extends <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&gt;</pre>
<div class="block"><p>
 A specialized <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent"><code>BackgroundInitializer</code></a> implementation that can deal with
 multiple background initialization tasks.
 </p>
 <p>
 This class has a similar purpose as <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent"><code>BackgroundInitializer</code></a>. However,
 it is not limited to a single background initialization task. Rather it
 manages an arbitrary number of <code>BackgroundInitializer</code> objects,
 executes them, and waits until they are completely initialized. This is
 useful for applications that have to perform multiple initialization tasks
 that can run in parallel (i.e. that do not depend on each other). This class
 takes care about the management of an <code>ExecutorService</code> and shares it
 with the <code>BackgroundInitializer</code> objects it is responsible for; so the
 using application need not bother with these details.
 </p>
 <p>
 The typical usage scenario for <code>MultiBackgroundInitializer</code> is as
 follows:
 </p>
 <ul>
 <li>Create a new instance of the class. Optionally pass in a pre-configured
 <code>ExecutorService</code>. Alternatively <code>MultiBackgroundInitializer</code> can
 create a temporary <code>ExecutorService</code> and delete it after initialization
 is complete.</li>
 <li>Create specialized <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent"><code>BackgroundInitializer</code></a> objects for the
 initialization tasks to be performed and add them to the <code>MultiBackgroundInitializer</code> using the
 <a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#addInitializer(java.lang.String, org.apache.commons.lang3.concurrent.BackgroundInitializer)"><code>addInitializer(String, BackgroundInitializer)</code></a> method.</li>
 <li>After all initializers have been added, call the <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#start()"><code>BackgroundInitializer.start()</code></a> method.
 </li>
 <li>When access to the result objects produced by the <code>BackgroundInitializer</code> objects is needed call the <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#get()"><code>BackgroundInitializer.get()</code></a> method. The
 object returned here provides access to all result objects created during
 initialization. It also stores information about exceptions that have
 occurred.</li>
 </ul>
 <p>
 <code>MultiBackgroundInitializer</code> starts a special controller task that
 starts all <code>BackgroundInitializer</code> objects added to the instance.
 Before the an initializer is started it is checked whether this initializer
 already has an <code>ExecutorService</code> set. If this is the case, this <code>ExecutorService</code> is used for running the background task. Otherwise the
 current <code>ExecutorService</code> of this <code>MultiBackgroundInitializer</code> is
 shared with the initializer.
 </p>
 <p>
 The easiest way of using this class is to let it deal with the management of
 an <code>ExecutorService</code> itself: If no external <code>ExecutorService</code> is
 provided, the class creates a temporary <code>ExecutorService</code> (that is
 capable of executing all background tasks in parallel) and destroys it at the
 end of background processing.
 </p>
 <p>
 Alternatively an external <code>ExecutorService</code> can be provided - either at
 construction time or later by calling the
 <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#setExternalExecutor(java.util.concurrent.ExecutorService)"><code>BackgroundInitializer.setExternalExecutor(ExecutorService)</code></a> method. In this case all
 background tasks are scheduled at this external <code>ExecutorService</code>.
 <strong>Important note:</strong> When using an external <code>ExecutorService</code> be sure that the number of threads managed by the service is
 large enough. Otherwise a deadlock can happen! This is the case in the
 following scenario: <code>MultiBackgroundInitializer</code> starts a task that
 starts all registered <code>BackgroundInitializer</code> objects and waits for
 their completion. If for instance a single threaded <code>ExecutorService</code>
 is used, none of the background tasks can be executed, and the task created
 by <code>MultiBackgroundInitializer</code> waits forever.
 </p></div>
<dl><dt><span class="strong">Since:</span></dt>
  <dd>3.0</dd>
<dt><span class="strong">Version:</span></dt>
  <dd>$Id: MultiBackgroundInitializer.java 1583482 2014-03-31 22:54:57Z niallp $</dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a></strong></code>
<div class="block">A data class for storing the results of the background initialization
 performed by <code>MultiBackgroundInitializer</code>.</div>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#MultiBackgroundInitializer()">MultiBackgroundInitializer</a></strong>()</code>
<div class="block">Creates a new instance of <code>MultiBackgroundInitializer</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#MultiBackgroundInitializer(java.util.concurrent.ExecutorService)">MultiBackgroundInitializer</a></strong>(<a href="http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ExecutorService</a>&nbsp;exec)</code>
<div class="block">Creates a new instance of <code>MultiBackgroundInitializer</code> and
 initializes it with the given external <code>ExecutorService</code>.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#addInitializer(java.lang.String, org.apache.commons.lang3.concurrent.BackgroundInitializer)">addInitializer</a></strong>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
              <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;?&gt;&nbsp;init)</code>
<div class="block">Adds a new <code>BackgroundInitializer</code> to this object.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected int</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#getTaskCount()">getTaskCount</a></strong>()</code>
<div class="block">Returns the number of tasks needed for executing all child <code>BackgroundInitializer</code> objects in parallel.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.html#initialize()">initialize</a></strong>()</code>
<div class="block">Creates the results object.</div>
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<h3>Methods inherited from class&nbsp;org.apache.commons.lang3.concurrent.<a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a></h3>
<code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#get()">get</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getActiveExecutor()">getActiveExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getExternalExecutor()">getExternalExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getFuture()">getFuture</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#isStarted()">isStarted</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#setExternalExecutor(java.util.concurrent.ExecutorService)">setExternalExecutor</a>, <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#start()">start</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>MultiBackgroundInitializer</h4>
<pre>public&nbsp;MultiBackgroundInitializer()</pre>
<div class="block">Creates a new instance of <code>MultiBackgroundInitializer</code>.</div>
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<h4>MultiBackgroundInitializer</h4>
<pre>public&nbsp;MultiBackgroundInitializer(<a href="http://docs.oracle.com/javase/6/docs/api/java/util/concurrent/ExecutorService.html?is-external=true" title="class or interface in java.util.concurrent">ExecutorService</a>&nbsp;exec)</pre>
<div class="block">Creates a new instance of <code>MultiBackgroundInitializer</code> and
 initializes it with the given external <code>ExecutorService</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>exec</code> - the <code>ExecutorService</code> for executing the background
 tasks</dd></dl>
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<a name="addInitializer(java.lang.String, org.apache.commons.lang3.concurrent.BackgroundInitializer)">
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<h4>addInitializer</h4>
<pre>public&nbsp;void&nbsp;addInitializer(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
                  <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;?&gt;&nbsp;init)</pre>
<div class="block">Adds a new <code>BackgroundInitializer</code> to this object. When this
 <code>MultiBackgroundInitializer</code> is started, the given initializer will
 be processed. This method must not be called after <a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#start()"><code>BackgroundInitializer.start()</code></a> has
 been invoked.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - the name of the initializer (must not be <b>null</b>)</dd><dd><code>init</code> - the <code>BackgroundInitializer</code> to add (must not be
 <b>null</b>)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if a required parameter is missing</dd>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if <code>start()</code> has already been called</dd></dl>
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<h4>getTaskCount</h4>
<pre>protected&nbsp;int&nbsp;getTaskCount()</pre>
<div class="block">Returns the number of tasks needed for executing all child <code>BackgroundInitializer</code> objects in parallel. This implementation sums up
 the required tasks for all child initializers (which is necessary if one
 of the child initializers is itself a <code>MultiBackgroundInitializer</code>
 ). Then it adds 1 for the control task that waits for the completion of
 the children.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#getTaskCount()">getTaskCount</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&gt;</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the number of tasks required for background processing</dd></dl>
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<h4>initialize</h4>
<pre>protected&nbsp;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&nbsp;initialize()
                                                                           throws <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Creates the results object. This implementation starts all child <code>BackgroundInitializer</code> objects. Then it collects their results and
 creates a <code>MultiBackgroundInitializerResults</code> object with this
 data. If a child initializer throws a checked exceptions, it is added to
 the results object. Unchecked exceptions are propagated.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html#initialize()">initialize</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/commons/lang3/concurrent/BackgroundInitializer.html" title="class in org.apache.commons.lang3.concurrent">BackgroundInitializer</a>&lt;<a href="../../../../../org/apache/commons/lang3/concurrent/MultiBackgroundInitializer.MultiBackgroundInitializerResults.html" title="class in org.apache.commons.lang3.concurrent">MultiBackgroundInitializer.MultiBackgroundInitializerResults</a>&gt;</code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the results object</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code> - if an error occurs</dd></dl>
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